code: def test_pretrained_tokenizers(self):
      self.check_tokenizer_from_pretrained(GPT2Tokenizer)
  
imports: import os
  import pickle
  import tempfile
  import unittest
  from typing import Callable, Optional
  import numpy
  from transformers import BatchEncoding, BertTokenizer, BertTokenizerFast, PreTrainedTokenizer, PreTrainedTokenizerFast, TensorType, TokenSpan, is_tokenizers_available
  from transformers.models.gpt2.tokenization_gpt2 import GPT2Tokenizer
  from transformers.testing_utils import CaptureStderr, require_flax, require_tf, require_tokenizers, require_torch, slow
label_desc: Use image node_id 3 for calling the TokenizerUtilsTest obj's underlying member method code with example usage: obj.test_pretrained_tokenizers() without return types